linux-kernel - Re: [PATCH v2] PCI: Add dummy implement for pci_clear

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Date:   Thu, 1 Jun 2023 01:44:52 +0800
From:   Sui Jingfeng <15330273260@....cn>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Ben Hutchings <bhutchings@...arflare.com>,
        Jesse Barnes <jbarnes@...tuousgeek.org>,
        kernel test robot <lkp@...el.com>, Li Yi <liyi@...ngson.cn>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        loongson-kernel@...ts.loongnix.cn,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v2] PCI: Add dummy implement for pci_clear_master()
 function

Hi,


Thanks a lot.

Can you receive my email?

I reply several email to you, but Thunderbird told me that may mail is 
returned.

Maybe you could read the content at lore.

```

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```


On 2023/6/1 01:28, Bjorn Helgaas wrote:
> On Wed, May 31, 2023 at 06:27:44PM +0800, Sui Jingfeng wrote:
>> As some arch(m68k for example) doesn't have config_pci enabled, drivers[1]
>> call pci_clear_master() without config_pci guard can not pass compile test.
>>
>>     drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c:
>>     In function 'etnaviv_gpu_pci_fini':
>>>> drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c:32:9:
>>     error: implicit declaration of function 'pci_clear_master';
>>     did you mean 'pci_set_master'? [-Werror=implicit-function-declaration]
>>        32 |         pci_clear_master(pdev);
>>           |         ^~~~~~~~~~~~~~~~
>>           |         pci_set_master
>>     cc1: some warnings being treated as errors
>>
>> [1] https://patchwork.freedesktop.org/patch/539977/?series=118522&rev=1
>>
>> V2:
>> 	* Adjust commit log style to meet the convention and add Fixes tag
>>
>> Fixes: 6a479079c072 ("PCI: Add pci_clear_master() as opposite of pci_set_master()")
>> Reported-by: kernel test robot <lkp@...el.com>
>> Closes: https://lore.kernel.org/oe-kbuild-all/202305301659.4guSLavL-lkp@intel.com/
>> Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> Applied to pci/misc for v6.5 as follows:
>
>    Author: Sui Jingfeng <suijingfeng@...ngson.cn>
>    Date:   Wed May 31 18:27:44 2023 +0800
>
>      PCI: Add pci_clear_master() stub for non-CONFIG_PCI
>      
>      Add a pci_clear_master() stub when CONFIG_PCI is not set so drivers that
>      support both PCI and platform devices don't need #ifdefs or extra Kconfig
>      symbols for the PCI parts.
>      
>      [bhelgaas: commit log]
>      Fixes: 6a479079c072 ("PCI: Add pci_clear_master() as opposite of pci_set_master()")
>      Link: https://lore.kernel.org/r/20230531102744.2354313-1-suijingfeng@loongson.cn
>      Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
>      Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
>      Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>
>> ---
>>   include/linux/pci.h | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index d0c19ff0c958..71c85380676c 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -1904,6 +1904,7 @@ static inline int pci_dev_present(const struct pci_device_id *ids)
>>   #define pci_dev_put(dev)	do { } while (0)
>>   
>>   static inline void pci_set_master(struct pci_dev *dev) { }
>> +static inline void pci_clear_master(struct pci_dev *dev) { }
>>   static inline int pci_enable_device(struct pci_dev *dev) { return -EIO; }
>>   static inline void pci_disable_device(struct pci_dev *dev) { }
>>   static inline int pcim_enable_device(struct pci_dev *pdev) { return -EIO; }
>> -- 
>> 2.25.1
>>